Скачать или смотреть Electrical Engineering, DC Circuit, SCIENTIFIC NOTATION AND METRIC PREFIXES

Gamma Classroom is presenting a series videos of "Introduction to Electrical Engineering". The series videos will be good for high school students who want to do electrical engineering jobs in the future.
The series videos will be good for new electrical engineers and help them for career developing. The series videos will also be good for the people who want to change their career path to electrical
engineering.

This video introduces the SCIENTIFIC NOTATION AND METRIC PREFIXES

In many disciplines of science and engineering, very large and very small numerical quantities must be managed. Some of these quantities
are mind-boggling in their size, either extremely small or extremely large.

numbers with many zero digits are not necessarily representative of a real-world quantity all the way to the decimal point.
When this is known to be the case, such a number can be written in a kind of mathematical "shorthand" to make it easier to deal with.
This "shorthand" is called scientific notation.

With scientific notation, a number is written by representing its significant digits as a quantity between 1 and 10 (or -1 and -10,
for negative numbers), and the "placeholder" zeros are accounted for by a power-of-ten multiplier.

The advantages of scientific notation are obvious: the number isn't as unwieldy when written on paper, and the significant digits are
plain to identify.

But what about very small numbers, like the mass of the proton in grams? We can still use scientific notation, except with a negative
power-of-ten instead of a positive one, to shift the decimal point to the left instead of to the right.

Just as in the case with the very large number, it is a lot easier for a human being to deal with this "shorthand" notation. As with
the prior case, the significant digits in this quantity are clearly expressed.

If we want to hold to standard convention for scientific notation, we must represent the significant digits as a number between 1 and 10.

The metric system, besides being a collection of measurement units for all sorts of physical quantities, is structured around the concept
of scientific notation. The primary difference is that the powers-of-ten are represented with alphabetical prefixes instead of by literal
powers-of-ten.

In recent years a new style of metric notation for electric quantities has emerged which seeks to avoid the use of the decimal point.
Since decimal points (".") are easily misread and/or "lost" due to poor print quality, quantities such as 4.7 k may be mistaken for 47 k.

The new notation replaces the decimal point with the metric prefix character, so that "4.7 k" is printed instead as "4k7". Our last
figure from the prior example, "0.267 m", would be expressed in the new notation as "0m267".

To express a quantity in a different metric prefix that what it was originally given, all we need to do is skip the decimal point to
the right or to the left as needed. Notice that the metric prefix "number line" in the previous section was laid out from larger to
smaller, left to right.

Those videos are from basic electrical concepts, gradually to expert level,
included most area of electrical engineering, electrical power system, renewable power system, industry automations, and so on,
from calculation, design, layout, studies, programs and more. The "introduction to Electrical Engineering" will include as follow:
1 DC Circuit,
2 AC Circuit,
3 Semiconductors,
4 Digital,
5 Useful reference, standards,
6 Experiments and tools,

In the DC circuit part, it will include as follows:
1.1 Basic concepts of electricity,
1.2 Ohm`s law,
1.3 Scientific notation and metric prefixes,
1.4 Series and parallel circuits,
1.5 Divider circuits and Kirchhoff`s laws,
1.6 Series-parallel combination circuits,
1.7 DC metering circuits,
1.8 Electrical instrumentation signals,
1.9 DC network analysis,
1.10 Batteries and power system,
1.11 Physics of conductors and insulators,
1.12 Capacitors,
1.13 Magnetism and electromagnetism,
1.14 Inductors,
1.15 RC and LR time constants

Lots of information from Reference Book: ``Lessons in Electric Circuits``. The original writer is: Tony R. Kuphaldt. Thank you very much!


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